Seiko Cal. 6694 - 638

Seiko 6694-638

The 6694-638 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6694 caliber with 35j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-86fbf2f3757f]

Also known as: Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
8.3mm
Lug Width
20mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
70m
Dial Color
Burgundy
Jewels
35j
Frequency
28,800 bph
Power Reserve
71 hours
Year
1978

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